Juveniles' right to proper placement refers to the appropriate setting where juvenile offenders are placed based on their age and needs. This right ensures that juveniles are placed in environments that cater to their rehabilitation and development rather than punishment. The correct answer to the question would be:
- **separately from adult offenders**: This option highlights the importance of keeping juveniles separate from adult offenders in facilities to protect them from potential harm and negative influences that could further impact their behavior and growth.
Placing juveniles with other juveniles allows for tailored interventions and programs that address their specific issues and promote their well-being. It fosters a more conducive environment for rehabilitation and learning, focusing on their individual needs rather than subjecting them to the same conditions as adult offenders.